Question 133795: Hello and thanks for helping me out in advance. This question is on a take home quiz and I"m not sure how to do it. The directions say to find the greatest common factor here is the question
-12ab, 21a^2, 18ab^2, -21b^2
now where i'm having the trouble is there are no common terms. Or at least I can't see any because there are non that have both an a and b or just an a or b I"m assuming 3 and then something after it but I have no clue..I know it's probably an easy answer but I can't seem to come up with it. Thanks
Christina
Answer by solver91311(24713)   (Show Source):
You can put this solution on YOUR website! Prime factors of  , -1, 2, 2,  , a, b (missing a 7)
Prime factors of  , , 7, a, a (missing a 2, a b and a -1)
Prime factors of  , 2, , 3, a, b, b (missing a 7 and a -1)
Prime factors of  , -1, , 7, b, b (missing a 2 and an a)
You are correct. The only factor in common is , so the GCF is 3.
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